Inspect Estuary Flow captures, materializations, collections and stats. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Estuary Flow connector, then ask in plain words. The AI picks the tools.
For data engineers who run data pipelines with Estuary Flow.
The AI lists the catalog entities you can read, filtered by name prefix or type. It shows the connector and last publication of each one.
The AI reads the stats of one catalog entity per time grain: bytes and documents read and written, usage seconds, warnings, errors and failures.
The AI lists publications with their job status, then reads the log lines of a failed job by its logs token. You see what went wrong.
The AI lists the available capture and materialization connectors, can limit them to recommended ones, and shows the versions with documentation links.
The AI creates a draft, adds a spec to it and publishes with dry_run on to validate it. Turning dry_run off applies the change to live pipelines.
Changes dataThe login page asks for your Estuary Flow refresh token.
Create one in Estuary Flow → Admin → CLI-API. Your token is used only to call the API on your behalf and to derive a private account id; it is never shown to anyone.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"estuary-flow": {
"url": "https://estuary-flow.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"estuary-flow": {
"type": "http",
"url": "https://estuary-flow.usefulapi.io/mcp"
}
}
} Run these commands. The second one opens the login page:
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Estuary Flow refresh token. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Pro | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+ | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Estuary Flow server only. Ask your AI to run estuary_flow_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with estuary_flow_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with estuary_flow_upgrade before then undoes the cancel. Or write to [email protected].
estuary_list_catalogestuary_get_catalog_specestuary_get_catalog_statsestuary_list_connectorsestuary_list_connector_versionsestuary_list_draftsestuary_list_draft_specsestuary_list_publicationsestuary_list_discoversestuary_list_rolesestuary_get_tenantestuary_view_task_logsestuary_create_draftestuary_upsert_draft_specestuary_publish_draftestuary_flow_usage_statusestuary_flow_request_featureestuary_flow_upgradeestuary_flow_cancel_subscriptionList captures, collections and materializations. See how much data a pipeline moved. Find out why a publication failed. Browse connectors and their versions. Stage a catalog change and validate it. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Estuary Flow. The server calls the Estuary Flow API with your own Estuary Flow access, so it sees only the data that your account can see.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
The login page asks for your Estuary Flow refresh token. See Before you connect for where to find it.
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Estuary Flow refresh token. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Estuary Flow API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Estuary Flow.
Yes, if you approve it. 3 of the 15 Estuary Flow tools can create or change data. The other 12 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Estuary Flow server only. Cancel any time: your paid plan then runs to the end of the paid period. Run estuary_flow_usage_status to see how many calls you used.
Ask the AI to run estuary_flow_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run estuary_flow_cancel_subscription. Your paid plan continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with estuary_flow_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.